| Document and Entity Information | Apr. 12, 2024 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | Cactus Acquisition Corp. 1 Ltd |
| Entity Tax Identification Number | 00-0000000 |
| Amendment Flag | false |
| Entity Central Index Key | 0001865861 |
| Document Type | 8-K |
| Document Period End Date | Apr. 12, 2024 |
| Entity Incorporation State Country Code | E9 |
| Entity File Number | 001-40981 |
| Entity Address, Address Line One | 4B Cedar Brook Drive |
| Entity Address, City or Town | Cranbury |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08512 |
| City Area Code | (609) |
| Local Phone Number | 495-2222 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Units Each Consisting Of One Class A Ordinary Share And Onehalf Of A Redeemable Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Units, each consisting of one Class A ordinary share and one-half redeemable warrant |
| Trading Symbol | CCTSU |
| Security Exchange Name | NASDAQ |
| Class A Ordinary Shares Par Value 00001 Per Share [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | CCTS |
| Security Exchange Name | NASDAQ |
| Redeemable Warrants Each Warrant Exercisable For One Class A Ordinary Share At An Exercise Price Of 1150 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Redeemable warrants, each warrant exercisable for one Class A ordinary share at an exercise price of $11.50 |
| Trading Symbol | CCTSW |
| Security Exchange Name | NASDAQ |
